
OpenSign
8.4#1 in e-signature softwareFrom $9.99 a monthFree planWebAPILinuxmacOS
Visit

| Fact | OpenSign | Skribble |
|---|---|---|
| API | OpenSign exposes a REST API authenticated with an x-api-token header and provides sandbox, production and EU endpoints. | Skribble offers an open REST API for custom integrations, with documentation and a demo account for testing. |
| API access | Yes | Yes |
| Audit trail | Yes | Yes |
| Bulk sending | Yes | Yes |
| Free plan | Yes | Yes |
| Integrations | The Professional plan lists Zapier integration, Dropbox import and custom Gmail or SMTP sending. | The integrations page lists Word, Excel, OneDrive, SharePoint Online, Google Drive, Power Automate, and Zapier, as well as industry solutions. |
| Product | OpenSign describes itself as an open-source PDF e-signature solution for signing, storing, and securing documents. | Skribble is digital signature software for signing documents online with simple, advanced, and qualified electronic signatures. |
OpenSign may suit individuals and businesses that need PDF signing, reusable templates, or API-based signing workflows. It also offers self-hosting instructions for those who want to run it on Linux, macOS, or Windows.
You want what its maker publishes above — check its page for the details.